//判断客户端
var bForcepc = fGetQuery("dv") == "pc";
function fBrowserRedirect(){
  var sUserAgent = navigator.userAgent.toLowerCase();
  var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
  var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
  var bIsMidp = sUserAgent.match(/midp/i) == "midp";
  var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
  var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
  var bIsAndroid = sUserAgent.match(/android/i) == "android";
  var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
  var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
  var bIsWx = sUserAgent.match(/micromessenger/i) == "micromessenger";

  if(bIsWx && !bForcepc){
    return "wx";
  }
  if(bIsIpad){
    var sUrl = location.href;
    if(!bForcepc){
      return "ipad";
    }
  }
  if(bIsIphoneOs || bIsAndroid){
    var sUrl = location.href;
    if(!bForcepc){
      return "mobile";
    }
  }
  if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){
    var sUrl = location.href;
    if(!bForcepc){
      return "wap";
    }
  }
  return "no";
}
function fGetQuery(name){//获取参数值
  var sUrl = window.location.search.substr(1);
  var r = sUrl.match(new RegExp("(^|&)" + name + "=([^&]*)(&|$)"));
  return (r == null ? null : unescape(r[2]));
}


//========================================根据页面尺寸定义html fontSize大小
(function (doc, win) {
  var docEl = doc.documentElement,
  resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
  recalc = function () {
    var clientWidth = docEl.clientWidth;
    var clientHeight= docEl.clientHeight;
    if (!clientWidth) return;
    var itemWidth=750, itemHeight=1334;
    if((itemWidth>itemHeight&&clientHeight>clientWidth) || (itemHeight>itemWidth&&clientWidth>clientHeight)){
      itemWidth=itemHeight;
    }
    // if(fBrowserRedirect()=='ipad'){
    //   itemWidth=2048;
    // }
    docEl.style.fontSize = 20 * (clientWidth / itemWidth) + 'px';
  };

  recalc();
  if (!doc.addEventListener) return;
  win.addEventListener(resizeEvt, recalc, false);
  doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);